Ansar (أنصار) are mentioned in the Quran, and were the citizens of Medinah that helped the prophet Muhammad during the migration from Makkah (literally, "the helpers").
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Ansar are referred to in verse (9:117) of chapter (9) sūrat l-tawbah (The Repentance):

Sahih International: Allah has already forgiven the Prophet and the Muhajireen and the An§ar who followed him in the hour of difficulty after the hearts of a party of them had almost inclined [to doubt], and then He forgave them. Indeed, He was to them Kind and Merciful.

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